private static CssPseudoClass[] ParsePseudoClasses(CssStringStreamReader reader)
{
var classes = new List <CssPseudoClass>();
while (reader.CurrentChar == ':')
{
reader.Advance();
if (!reader.TryReadIdentifier(out var className))
{
return(null);
}
if (CssFunctionalPseudoClass.TryConvertToFunctionalPseudoClassType(className, out var functionalClassType))
{
if (!reader.Read('(') ||
!TryParseSelectorList(reader, out var functionalSelectors) ||
!reader.Read(')'))
{
return(null);
}
classes.Add(new CssFunctionalPseudoClass(functionalSelectors, functionalClassType));
continue;
}
if (CssUserActionPseudoClass.TryConvertToUserActionPseudoClassType(className, out var userActionClassType))
{
classes.Add(new CssUserActionPseudoClass(userActionClassType));
continue;
}
if (CssStructuralPseudoClass.TryConvertToStructuralPseudoClassType(className, out var structuralPseudoClassType))
{
if (!reader.Read('(') ||
!TryParseSelectorList(reader, out var structuralSelectors) ||
!reader.Read(')'))
{
structuralSelectors = new CssSelectorList();
}
classes.Add(new CssStructuralPseudoClass(structuralSelectors, structuralPseudoClassType));
continue;
}
return(null); // unknown / unhandled pseudo class
}
return(classes.ToArray());
}
/// <summary>
/// Tries to parse a collection of properties (name value pairs, e.g. 'fill:#000') of a style body
/// </summary>
public static bool TryParseStyleRuleBodyProperties(CssStringStreamReader reader, out Dictionary <string, CssStylePropertyValue> properties)
{
properties = new Dictionary <string, CssStylePropertyValue>();
reader.SkipWhitespaceAndComments();
var builder = new StringBuilder();
while (!reader.IsEndOfStream && reader.CurrentChar != '}')
{
if (!reader.TryReadIdentifier(out var name))
{
return(false);
}
reader.SkipWhitespaceAndComments();
if (!reader.Read(':'))
{
return(false);
}
reader.SkipWhitespaceAndComments();
while (reader.CurrentChar != ';' && reader.CurrentChar != '}' && !reader.IsEndOfStream)
{
builder.Append(reader.CurrentChar);
reader.Advance();
}
properties[name] = new CssStylePropertyValue(builder.ToString());
builder.Clear();
if (reader.CurrentChar == ';')
{
reader.Read(';');
}
reader.SkipWhitespaceAndComments();
}
return(true);
}
public static bool TryParseRules(CssStringStreamReader reader, out CssStyleRulesList rules)
{
rules = new CssStyleRulesList();
reader.SkipWhitespaceAndComments();
while (!reader.IsEndOfStream)
{
if (!TryParseSelectorList(reader, out var selectors) ||
!reader.SkipWhitespaceAndComments() ||
!reader.Read('{') ||
!TryParseStyleRuleBodyProperties(reader, out var properties) ||
!reader.SkipWhitespaceAndComments() ||
!reader.Read('}'))
{
return(false);
}
rules.Add(new CssStyleRule(selectors, properties));
reader.SkipWhitespaceAndComments();
}
return(true);
}
){kind=link}